In this section, Paul reminds the Corinthians that he had a shameful past but he has renounced it. His handling of the word of God has been pure and straightforward for their benefit. He allows that if the gospel is veiled, it is so because of the blinded and wicked minds of unbelievers.
Their minds are blinded out of pride and wickedness and are further rendered blind because of the actions of Satan himself, the god of this world.
Paul has made a conscious commitment by the grace of the Holy Spirit to focus solely on the Lord Jesus Christ preaching Him and rendering himself a slave to the church at Corinth as he does to every other church that he serves. An exposition of 2 Corinthians 4: 2-5.